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Only compare the first 3 bytes when trying to detect LZMA compression.

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This patch changes the logic in `detect_compression_method()` to only
use the 3 first bytes when checking if a given input is LZMA encoded.
This commit is contained in:
Alexander Færøy 2017-04-27 20:07:08 +02:00
parent 480dab4f2f
commit e5122b91a9
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GPG key ID: E15081D5D3C3DB53
1 changed files with 2 additions and 2 deletions
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src/common/compress.c
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@ -255,8 +255,8 @@ detect_compression_method(const char *in, size_t in_len)
} else if (in_len > 2 && (in[0] & 0x0f) == 8 && } else if (in_len > 2 && (in[0] & 0x0f) == 8 &&
(ntohs(get_uint16(in)) % 31) == 0) { (ntohs(get_uint16(in)) % 31) == 0) {
return ZLIB_METHOD; return ZLIB_METHOD;
} else if (in_len > 3 && } else if (in_len > 2 &&
fast_memeq(in, "\x5d\x00\x00\x00", 4)) { fast_memeq(in, "\x5d\x00\x00", 3)) {
return LZMA_METHOD; return LZMA_METHOD;
} else if (in_len > 3 && } else if (in_len > 3 &&
fast_memeq(in, "\x28\xb5\x2f\xfd", 4)) { fast_memeq(in, "\x28\xb5\x2f\xfd", 4)) {